465
AUUS46 KPDT 071325
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PST SUN DEC  7 2025

*** AIR DISPERSION CATEGORIES:   GOOD, FAIR, POOR ***

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 7-14 MPH.         SW 14-19 MPH.
TRANSPORT WINDS               S 8-14 MPH.         SW 17-21 MPH.
MIXING HEIGHT                 NEAR SURFACE.       2000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR MON DEC 8         GOOD.
OUTLOOK FOR TUE DEC 9         FAIR.

VENTILATION INDEX (CATEGORY)  49 (POOR).          157 (POOR).
OUTLOOK FOR MON DEC 8         220 (POOR).
OUTLOOK FOR TUE DEC 9         212 (POOR).

FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 4-9 MPH.         SW 9-16 MPH.
TRANSPORT WINDS               S 6-12 MPH.         W 8-21 MPH.
MIXING HEIGHT                 NEAR SURFACE.       2500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR MON DEC 8         GOOD.
OUTLOOK FOR TUE DEC 9         POOR.

VENTILATION INDEX (CATEGORY)  56 (POOR).          134 (POOR).
OUTLOOK FOR MON DEC 8         227 (POOR).
OUTLOOK FOR TUE DEC 9         80 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 6-8 MPH.          S 12-16 MPH.
TRANSPORT WINDS               S 8-11 MPH.         S 13-18 MPH.
MIXING HEIGHT                 4000 FT MSL.        4500 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR MON DEC 8         FAIR.
OUTLOOK FOR TUE DEC 9         FAIR.

VENTILATION INDEX (CATEGORY)  128 (POOR).         218 (POOR).
OUTLOOK FOR MON DEC 8         284 (POOR).
OUTLOOK FOR TUE DEC 9         159 (POOR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 8-16 MPH.         SW 13-22 MPH.
TRANSPORT WINDS               S 9-16 MPH.         SW 17-24 MPH.
MIXING HEIGHT                 NEAR SURFACE.       2500 FT MSL.
DISPERSION CATEGORY           FAIR.               GOOD.
OUTLOOK FOR MON DEC 8         GOOD.
OUTLOOK FOR TUE DEC 9         FAIR.

VENTILATION INDEX (CATEGORY)  78 (POOR).          223 (POOR).
OUTLOOK FOR MON DEC 8         301 (FAIR).
OUTLOOK FOR TUE DEC 9         217 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      116 (POOR)
ELLENSBURG     52 (POOR)
GOLDENDALE    206 (POOR)
TRI-CITIES    144 (POOR)
WALLA WALLA   182 (POOR)
YAKIMA         51 (POOR)
BEND          674 (GOOD)
PRINEVILLE    232 (POOR)
ENTERPRISE    127 (POOR)
HERMISTON      99 (POOR)
JOHN DAY      212 (POOR)
LA GRANDE     150 (POOR)
MADRAS        499 (FAIR)
MEACHAM       149 (POOR)
PENDLETON     190 (POOR)
REDMOND       346 (FAIR)
SENECA        233 (POOR)
THE DALLES    148 (POOR)

METEOROLOGICAL INFORMATION PROVIDED IN THIS PRODUCT REPRESENTS ONLY
SOME OF THE FACTORS USED IN BURN DECISIONS.  BURN DECISIONS ARE
OUTSIDE THE PURVIEW OF THE NATIONAL WEATHER SERVICE.

THE VENTILATION INDEX IS A TOOL TO ASSIST SMOKE MANAGEMENT
AGENCIES IN DETERMINING BURN OR NO BURN DECISIONS.  A VENTILATION
INDEX GRAPHIC IS ON THE PENDLETON WEBSITE AT THE FOLLOWING ADDRESS:
HTTPS://WWW.WEATHER.GOV/PDT/DSSBRIEFING

IF YOU WOULD LIKE TO KNOW MORE ABOUT THIS PRODUCT...CONTACT THE
NATIONAL WEATHER SERVICE IN PENDLETON.
$$